Bunsen burner



sept. 1o, 1940. R. MCC. SAYERS 2,214,284

BUNSEN BURNER Filed March 24, 1938 REUEL M .5A YERJ Patented Sept. 10, 1940 UNITED STATES PATENT YOFFICEv BUNSEN BURNER Application March 24, 1938 Serial No. 197,812

2 Claims. (Cl. 158-99) This invention relates to Bunsen type burners for burning hydro-carbon fuels including gas, oil, oil vapors and the like. It relates more particularly to a burner suitable for burning natural or mixed natural and manufactured gas.

It has been found that, while the ordinary cylindrical burner having a discharge oriiice of the same diameter as the body, is satisfactory for burning manufactured gas, difficulty was encountered in burning natural gas or mixtures of natural and articial gas. 'Ihe carbon and the B. t. u. content of this natural gas is ordinarily higher than the B. t. u. content of the artificial gas, and the natural gas thus requires more air for complete combustion. In supplying more air to a burner of the usual type the flame may burn at an appreciable distance from the burner and is easily blown out.

Various devices have been proposed for overcoming this difficulty, but the devices have been frail and easily broken.

It is a general object of my invention to provide a simple burner which will tend to anchor or tie the flame to the end of the burner.

Another object of the invention is to provide a gas burner of this general character in which a small name is constantly maintained close to the discharge end of the tube, thereby maintaining a llame in the mixture being discharged from the tube.

Another object of my invention is to provide a device of the above character which is not readily broken during shipment and installation of the burner.

Still another object of this invention is to provide a simple, reliable and inexpensive device of the above character.

Other and further features and objects of the invention will be more apparent to those skilled in the art upon a consideration of the accompanying drawing and following specification, wherein is disclosed a single exemplary embodiment of the invention, with the understanding, however, that such changes may be made therein as fall within the scope of the appended claims, without departing from the spirit of the invention.

In said drawing:

Figure 1 is a view in perspective of a burner constructed according to one embodiment of my invention.

Figure 2 is a view partly in section of a burner constructed according to my invention and with the remaining portion of the burner shown in perspective, and

Figure 3 is an enlarged framentary view of the end of the burner shown in Figures 1 and 2v.

Referring now to the drawing: A

A burner constructed according to one embodiment of my invention includes a cylinder or tube I0 having a frustro-conical entrance portion II at the lower end thereof. Legs I2, which are a part of the burner head I0, support the enlarged portion II and are themselves supported by the thimble I3. The thimble I3 is secured on the 10 orice barrel or body 20 of a gas jet or orifice and this body member is in turn threaded on the end of the supply pipe I4. The thimble I3 is secured in place on the orice barrel 20 by means of the set screw I6. The gas from the pipe I4 passes 15 into the orifice body 20 and is discharged through the orice tip 20a. The jet of row gas issuing from the tip 20a entrains or draws in a suflicient amount of primary air to provide complete combustion of the mixture issuing'from the burner 20 head.

The upper end of the cylindrical body I0 is partially closed by the inwardly projecting flange I1. This flange has a number of small vertical openings I8 therethrough, and it is this flange 25 and the vertical openings therethrough which Cause the small ignition flame I9 to bel maintained so that the gas and air mixture, issuing from the large central opening 2I of the burner, will always be ignited to form the flame 22. It is to 30 be noted that the upper outer edge or end of the burner, indicated at 23, is tapered and this taper is of material assistance in preventing injury to the tip of the burner, in shipment and installation. p 35 In addition to the flange I 1, I may also use the flange 24. This additional flange or auxiliary orice ring will be found to be of material assistance in slowing down thev velocity'of the air and gas mixture. I preferably provide openings 40 26 through this auxiliary ring which openings are preferably co-axial with the openings I8.

The velocity of the combustible mixture issuing from the small/openings in the outer ring is quite low and small pilot names I9 are easily 45 maintained. These pilot flames in turn maintain the ignition of the gases issuing from the large central opening 2l of the burner.

I have found that a very satisfactory maintenance flame is secured by utilizing 17 No. 52 50 openings in the flange I'I, and that a satisfactory diameter for the large opening 2| is 5/8 of an inch. I have found a satisfactory inner diameter of the cylinder I0 for this size of burner to be of an inch. Of course the outer diameter 55 of the cylinder is sufficient to furnish a reasonable thickness to the material.

Such a burner will consume gas fuel to furnish approximately 7500 B. t. u. of heat per hour.

Although I have described a specific embodiment of my invention, it is apparent that modifications thereof may be made by those skilled in the art, Such modifications may be made without departing from the spirit and scope of my invention as set forth in the appended claims.

I claim as my invention: v

1. In a Bunsen burner, a burner tube, an in- Wardly extending flange at the end of the tube, a similar inwardly extending flange within the tube and spaced a short distance from the firstmentioned flange, thereby forming an annular chamber open to the bore of said tube, and a plurality of oo-axially aligned pilot openings extending through both flanges, the second mentioned flange adapted to slow down and help to thoroughly mix the main body of the combustible mixture, the pilot openings adapted to further slow down the velocity of the mixture issuing therefrom.

2. In a Bunsen type burner having a mixing tube, the mixing tube being provided with an inwardly projecting flange approximately rectangular in cross section at the upper end thereof and a second inwardly projecting flange also substantially rectangular in cross section disposed within the tube below-the first named flange thereby forming an` annular chamber open tothe bore of said tube and the flanges having small co-axially aligned openings therethrough whereby gas may pass through the co-axial openings to provide a pilot flame around the edge of the main flame, and whereby gas and air passing through the tube are mixed by the inside flange and are slowed up by the flange at the discharge end of the burner tube to thus provide a large centrally located burner flame, and a plurality of small pilot flames surrounding the main flame and providing ignition flames for maintaining burning of the main ame.

REUEL MCCLELLAND SAYERS. 

